Friday 26 June 2020

visible light - Malus Law in Michelson Morley experiment



My book of physics (I don't quote it here, since it is in Catalan) says that in the 1887 Michelson - Morley experiment, after getting the transversal and longitudinal phase shifts, they claim that the number of fringer observed will belong to the number of times that both phase shifts contains 2 pi because that is the phase two maximums repeat. My question is: why is here said that waves should form maximums? Because as I understand it, the expected result was to obtain a destructive interference whose phase shift could be jsed to determine Earth's velocity. If they were expecting a destructive interference, shouldn't the book use the phase two minimums repeat?




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